wpf

Children of 'System.Windows.Controls.UIElementCollection' cannot be null. Object derived from UIElement expected

I got this exception and don't know what to do with it. I'm using TreeListView that I found on the net <tv:TreeListView x:Name="listView" ItemsSource="{Binding TreeRoot}" Margin="5" Width="640" Height="732"> </tv:TreeListView> Does someone had this exception ? ...

WPF: Bitmap doesn't show

I want to create some kind of simulation. There will be numerous sprites floating around. Because I think that rendering every frame thousand times the same primitives which make up a sprite, will be slow, I want render them once into a bitmap and then show this sprite every frame. But it doesn't seem to work, the screen stays white. M...

Ui Doesn't getUpdated

this is my code: <Window x:Class="WpfApplication1.Window2" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Window2" Height="300" Width="300"> <Grid> <Grid.RowDefinitions> <RowDefinition Height="60*" /> <RowDefinition Height="202*" /> ...

How can a total newbie design a UI with Blend 3 ?

Hi guys, I am totally new to WPF. I learned that Blend is a tool that is used to design UI for WPF applications. Is there a standard procedure to follow while designing UIs ? Can you give demo examples of UI with source code? ...

WPF- Problem with TextBox in DataTemplate.

I am working on an application where Repository objects are displayed via a DataTemplate that contains a modified version of a TextBox, which supports binding to the SelectionStart, SelectionLength, and VerticalOffset. The DataTemplate looks like this: <DataTemplate DataType="{x:Type m:Repository}"> <controls:ModdedTextBox x:Name="tex...

DataGrid , TextBox - binding and instant updates

Hi, My app. contains the window in the picture: The ItemsSource of the DataGrid is set to _editList ( declared as IList < Vendor > _editList;). The data grid is set to Read Only. The Vendor Name text box has the binding set as : Text="{Binding ElementName=dataGridVendors, Path=SelectedItem.Name, Mode=TwoWay}" This works wel...

WPF How to make "layer"

Hello... I am developing a small appplication which is single windowed... I have formated everything with care .. The window contains a grid which has 2 columns.. The second is auto and the first is of type *.(takes the remaining space) Is there a way to change the content of the first column ?(to display a chart for example) The only ...

Capture hyperlink click in HTML displayed in WPF Frame

Hello, and sorry if that was asked before, With a WPF Frame Control I can display a website. WPF appears to delegate Rendering to the resident IE installation. Unfortunately it appears that when I click some link in the displayed page, WPF does not register this as Navigation, e.g. Navigating event doesn't fire. I can almost imagine w...

Rendering TabItem in WPF (with powerhsell)

Probably a simple question, but my brain isn't working today. I am writing a small powershell script to do various tasks. These tasks are logically grouped into tabs, using a WPF TabControl. A couple of the tabs do some checks to compare local file dates with server file dates, which takes a bit of time. (Only a few seconds, admittedly...

MVVM How to Design a ViewModel for a Datagrid which columns are chosen by user

So when i have a Datagrid which i want to fill with data from my Database. I normally design a ViewModel with the Data i wanted to display. But how do i create an ViewModel for my Datagrid when i dont know before which data it will display in it ? So when i allow the user of my application to specify the Columns from the database table ...

Change Color to a specific node in wpf TreeView

I have a service that retrieves to me a list of objects and the ID of one of them. I'm binding them to a TreeView with hyrarchial template and I want the one that has the given Id to be with different color. How can I do that ? ...

Combining ItemsControl with draggable items - Element.parent always null

I'm binding an ItemsControl with Canvas as ItemsPanelTemplate to an ObservableCollection. I want to make the items draggable using the DraggableExtender as posted in http://stackoverflow.com/questions/294220/dragging-an-image-in-wpf (I don't want to use transforms - I need to use the Canvas Left and Top properties) It's defined as : ...

Question about Data Template or Style in WPF xaml

Hi, I have a textbox that has the following simple XAML (not necessary to read it - just have it for reference): <TextBox Name="m_ctrlUserDeviceType" Style="{StaticResource textStyleTextBox}" Text="{Binding Source={x:Static api:MySettings.Instance}, Path=UserDeviceType, ValidatesOnExceptions=true, NotifyOnValidationError=true}" Validati...

Select a WPF UIElement in a FlowDocument

Hi, I have a FlowDocument (inside a RichTextBox) that contains UIElement controls such as CheckBoxes. I need the user to be able to click on the CheckBox to select it to change the controls properties such as label, background color etc. The problem I have is that when I click it it only checks, or unchecks the CheckBox as you would exp...

WPF datagrid binding : add new item

Hi, I have the following window in my app: The list is declared as : IList < Vendor > _editList; and the datagrid is populated via : dataGridVendors.ItemsSource = _editList; The "New" button creates a new Vendor and adds the vendor the _editList. Vendor vendor = new Vendor(); _editList.Add(vendor); Unfortunately.... the new ven...

Access control in ListView in WPF

Hi, I have a listview like this and would like to access the textbox of SELECTED ITEM in side? lsitview.blah.blah.findTheTextBox("blah").Name="good!"; How am I able to do that? Thanks <ListView Name="listview"> <ListView.View> <GridView> <GridViewColumn> <GridViewColumn.CellTemplate> <DataTemplate> ...

Cannot click and select item in a listview (WPF)

Hi guys, I have a listview with following column <GridViewColumn Header="name" local:GridViewSort.PropertyName="Name"> <GridViewColumn.CellTemplate> <DataTemplate> <TextBox Text="{Binding Name}" IsReadOnly="{Binding IsReadOnly}" Style="{StaticResource txtEditable}" KeyDown="SeqRenameTextBox_KeyDown" LostFocus="SeqRename...

VS2008 WPF Xaml: Is there a path length limit when loading an assembly?

Hello, It seems that there is a path lenght limit for VS2008 when loading XAML assemblies. Using the Microsoft sample Southridge, if the project is stored on "C:\Projects\C# samples\Southridge_Labs\1.Southridge_Fundamentals\Start" the designer does not load the assemblies. But if I copy my files the project to the root (C:\Southridge_...

"are you missing a using directive or an assembly reference?" but the namespace and reference are correct

Hi, I've got the following error when builing my project. The type or namespace name 'OvuMenu' could not be found (are you missing a using directive or an assembly reference?) But I have put a using in my code and a reference to the dll. It is a WPF application that exists of 3 projects. I checked the references, even intellisense wo...

Different 'views' in a single WPF window

I'm doing a VB.Net subject at university and the major assignment is the creation of a WPF application. The application is management-focused (adding, modifying, deleting entries, etc). As these are all rather disparate tasks I'm thinking to create a tabbed interface for my assignment (in a similar vein to Spybot's interface: http://www...