Question

Here is the code that cause me problem since few hours:

        TabItem newTab = new TabItem();
        newTab.Header = source.Name;
        newTab.Content = source.GetGui();
        newTab.HorizontalContentAlignment = HorizontalAlignment.Stretch;
        newTab.VerticalContentAlignment = VerticalAlignment.Stretch;
        this.inputSourceDisplay.Items.Add(newTab);

The output is the control (from GetGui()) is showing but in the center vertical and in the center horizontal but haven’t stretch at it suppose.

How can I solve that or how can I debug that?

Answer 1

What does your “GetGui()” method return? Is it a UserControl? By default, UserControls explicitly set their Width and Height properties:

<UserControl x:Class="WpfApplication1.UserControl1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Height="300" Width="300">

With the Height and Width explicitly set, the UserControl won’t respond to attributes like HorizontalContentAlignment.