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inconsistent rendering of label

Posted By:      Posted Date: September 09, 2010    Points: 0   Category :Windows Application
Hey, I have a fairly simple WPF application (in a more complicated scenario than this test example posted here this is of importance) with one main window containing a Button, a TabControl on the outside and then one inner part containing of a GroupBox with a Grid which is supposed to display some content (actually just labels) in a rectangle: <Window x:Class="WpfApplication1.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="MainWindow" Height="480" Width="640" Loaded="Window_Loaded"> <TabControl Height="440" Width="620" HorizontalAlignment="Left" Name="tabControl1" VerticalAlignment="Top"> <TabItem Header="tabItem1" Name="tabItem1"> <Grid Height="400" Width="600"> <Button Content="Button" Height="23" HorizontalAlignment="Left" Name="button1" VerticalAlignment="Top" Width="75" /> <GroupBox Header="new map" Name="groupBoxNewMap" IsEnabled="True" Margin="0,20,0,0"> <Grid Height="361" Width="580" Name="

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