DropDownContent with WindowsFormsHost

[Pov Ser]

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="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    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>

[Zarko]

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

 

 

[Pov Ser]

It works. Thank you kind.