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DropDownContent with WindowsFormsHost

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Pov Ser
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Pov Ser asked on 21 May 2014, 07:46 PM
I'm using DropDownButton to display Winform or HWND window, but it seems that it does not display any Winform in DropDownContent

Here is example:
<Window
    xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation" x:Class="MainWindow"
     xmlns:Forms32="clr-namespace:System.Windows.Forms;assembly=System.Windows.Forms"
    Title="MainWindow" Height="350" Width="525">
    <Grid>
 
        <telerik:RadDropDownButton Content="Browser" HorizontalAlignment="Left" Height="Auto" IsOpen="False" Margin="36,21,0,0" VerticalAlignment="Top" Width="Auto" DropDownWidth="800" DropDownHeight="600">
            <telerik:RadDropDownButton.DropDownContent>
                <WindowsFormsHost>
                    <Forms32:WebBrowser Url="google.com"></Forms32:WebBrowser>
                </WindowsFormsHost>
            </telerik:RadDropDownButton.DropDownContent>
        </telerik:RadDropDownButton>
         
        <telerik:RadDropDownButton Content="Button" HorizontalAlignment="Left" Height="Auto" IsOpen="False" Margin="129,21,0,0" VerticalAlignment="Top" Width="Auto">
            <telerik:RadDropDownButton.DropDownContent>
                <WindowsFormsHost>
                    <Forms32:TextBox Text="Test Text Box"></Forms32:TextBox>
                </WindowsFormsHost>
            </telerik:RadDropDownButton.DropDownContent>
        </telerik:RadDropDownButton>
 
    </Grid>
</Window>

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Zarko
Telerik team
answered on 26 May 2014, 09:28 AM
Hi Pov,
The problem is that WindowsFormsHost doesn't work in Popups with AllowsTransparency = True and by default we set it to true in code behind. What you can do is handle the loaded event and change it manually:
private void OnDropDownButtonLoaded(object sender, RoutedEventArgs e)
{
    var dropDownButton = sender as RadDropDownButton;
    if (dropDownButton == null) return;
 
    var popup = dropDownButton.ChildrenOfType<Popup>().FirstOrDefault();
    if (popup != null)
        popup.AllowsTransparency = false;
}
I hope I was able to help you.

Regards,
Zarko
Telerik
 
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Pov Ser
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answered on 27 May 2014, 08:33 AM
It works. Thank you kind.
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Zarko
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Pov Ser
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