Open WPF Popup on TextBox focus

Question

I want to open a popup when the focus is on a text box Here is the code I wrote :

<Window x:Class="Testpopup.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="MainWindow" Height="350" Width="525">
<Grid>
    <StackPanel>
        <TextBox  x:Name="text" GotKeyboardFocus="text_GotKeyboardFocus" />
        <Button Click="Button_Click"  Content="but"/>
        <Popup x:Name="popup" Width="100" Height="100" PlacementTarget="{Binding ElementName=text}"
            StaysOpen="False">
            <Grid>
                <StackPanel>
                    <DatePicker />
                    <TextBox />
                </StackPanel>
            </Grid>
        </Popup>

    </StackPanel>
</Grid>

 private void Button_Click(object sender, RoutedEventArgs e)
    {
        popup.IsOpen = true;
    }

    private void text_GotKeyboardFocus(object sender, KeyboardFocusChangedEventArgs e)
    {
        popup.IsOpen = true;
    }

If I Click on the button everything works fine If I Click on the text box the popup open and close

If I remove StaysOpen="False" the popup open but never close

I try to set the focus on the popup before opening it but it does not work as well

Do you have any idea ?

Many thanks, Nidal.

Answer 1

Add the following binding to your Popup-declaration:

StaysOpen="{Binding ElementName=text,Path=IsKeyboardFocused}"

This should do the trick.