How to increase the size of external used resource in different page WPF

Question

Hi Experts,

I have created a WPF Tab Control in a user control and trying to use the Tab control in other user control. But the Tab Control appear very small. I tried to set the horizontalcontentalignment and verticalcontentalignment property to stretch but still no effect. I do not want to hard code the height and width as might have scalability issue.

//tabcontrol.xaml

<Grid>

  <TabControl  Name="myPropertyTabCtrl" HorizontalAlignment="Stretch"
                HorizontalContentAlignment="Stretch" VerticalAlignment="Stretch" 
               VerticalContentAlignment="Stretch" >

    <TabItem Header="Status" Name="myStatusTab" />

    <TabItem Header="Service" Name="myServiceTab"/>

  </TabControl>

</Grid>

//Mainpage.xaml

//MainPage.xaml.cs

I tried in constructor as well:

myPropertyTabCtrl.InvalidateArrange();

myPropertyTabCtrl.InvalidateMeasure();

myPropertyTabCtrl.InvalidateVisual();

myPropertyTabCtrl.UpdateLayout();

Any help how can increase the size of tab control in main page so that can span in all four columns not only in one column?

Thanks and regards, Maverick