Hi support!

I created a simple example to try to understand the problem... I have a ListBox and a RadDropDownButton  control, with a ListBox inside.

I would like to see both ListBox transparent...But ListBox inserted into RadDropDownButton was not transparent, why? Is there some way to do it with RadDropDownButton ?

Thanks!




<UserControl
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:telerik="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls"
    xmlns:telerikNavigation="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls.Navigation"
    xmlns:System="clr-namespace:System;assembly=mscorlib"
    x:Class="Example_sl.MainPage">
 
    <Grid Height="175" Width="728" Background="#FFE23131">


        <ListBox Height="94" HorizontalAlignment="Left" Margin="491,20,0,0" Name="listBox1" VerticalAlignment="Top" Width="188" UseLayoutRounding="True" BorderThickness="1" Background="#7EFFFFFF">
            <ListBoxItem Content="1111" Height="26">
             </ListBoxItem>
            <ListBoxItem Content="3333">
            </ListBoxItem>
        </ListBox>
        
        <telerik:RadDropDownButton Content="Actions" VerticalAlignment="Top" HorizontalAlignment="Left">
            
            <telerik:RadDropDownButton.DropDownContent>
                <ListBox Height="94" HorizontalAlignment="Left"  Name="listBox21" VerticalAlignment="Top" Width="188" UseLayoutRounding="True" BorderThickness="1" Background="#7EFFFFFF">
                    <ListBoxItem Content="1111" Height="26"/>
                    <ListBoxItem Content="3333"/>
                </ListBox>
            </telerik:RadDropDownButton.DropDownContent>
            
        </telerik:RadDropDownButton>
    </Grid>

</UserControl>

Hello Fabiana,

To achieve this transparent behavior you have to edit the style of the RadDropDownButton and to remove the Background property in the DropDownPopup element in the ControlTemplate. You can examine the attached sample project and if you have further questions feel free to ask.

Best wishes,
Viktor Tsvetkov
the Telerik team