WPF TextBox repaints multiple times with mouse hover

Question

Hi,

I am using Windows Performance suite (which part of Microsoft Windows SDK) to profile my sample application. I am using the "Perforator" with an option "Show dirty-region update overlay", which enables me to see when and where areas are redrawn in an application.

When I hover mouse over a TextBox control then I see that it is redrawn multiple times and the CPU utilization goes up. I tested with a very simple window with just a TextBox control and a button control.

Is this normal for WPF to redraw control on mouse hover? Is there anything that I can do to minimize this?

Here is the windows that I am using

<Window x:Class="WpfApplication1.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Window1" Height="300" Width="300">
    <Grid>
        <StackPanel Orientation="Horizontal">
            <TextBox Height="25" Width="150" >
            </TextBox>
            <Button Margin="10,0,0,0" Height="25">1211</Button>
        </StackPanel>
    </Grid>