[Solved] Open RadDropDownButton from control event inside Content

[Semyon Akimov]

Hello.

I have dropdownbutton with textbox inside content.
Inside of TextBox MouseLeftButtonDown event handler I am trying to open dropdown.
So on first click on textbox dropdown opens and immediately closes.
On second click all works as expected - drop down opens normally.

<telerik:RadDropDownButton x:Name="PointDropDown"
                                      Grid.Column="1"
                                      Height="22"
                                      Width="600"
                                      Margin="3"
                                      HorizontalContentAlignment="Stretch"
                                      VerticalContentAlignment="Stretch">
    <telerik:RadDropDownButton.Content>
        <TextBox x:Name="SelectedPointTextBox"
                         BorderBrush="Transparent"
                         Background="Transparent"
                         HorizontalAlignment="Stretch"
                         Cursor="Arrow"
                         VerticalAlignment="Stretch"
                         IsReadOnly="True"
                         Padding="0, -3, 0, -3"
                         Text="TextBlockText"
                         IsTabStop="False"
                         TextAlignment="Left"
                         MouseLeftButtonDown="SelectedPointTextBoxMouseLeftButtonDown"/>
    </telerik:RadDropDownButton.Content>
    <telerik:RadDropDownButton.DropDownContent>
        <telerik:RadGridView x:Name="PointGridView"
                                     MaxWidth="450"
                                     MaxHeight="350"
                                     IsReadOnly="False"
                                     RowIndicatorVisibility="Collapsed"
                                    >
        </telerik:RadGridView>
    </telerik:RadDropDownButton.DropDownContent>
</telerik:RadDropDownButton>

private void SelectedPointTextBoxMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            PointDropDown.Focus();
            PointDropDown.IsOpen = true;
        }

You can download sample project here
How to fix this behavior?

Thanks.

[Zarko]

Hi,

 The default behavior of the RadDropDownButton is to open on mouseUp so I don't think that you need this event handler - the DropDownButton will automatically open.
I've attached a project without the handler so could you please examine it and see it this is what you're looking for?

Regards,
Zarko
the Telerik team