Question

I have a Window with my user control and I would like to make usercontrol width equals window width. How to do that?

The user control is a horizontal menu and contains a grid with three columns:

<ColumnDefinition Name='LeftSideMenu' Width='433'/> <ColumnDefinition Name='Middle' Width='*'/> <ColumnDefinition Name='RightSideMenu' Width='90'/> 

That is the reason I want the window width, to stretch the user control to 100% width, with the second column relative.

EDIT:

I am using a grid, there is the code for Window:

<Window x:Class='TCI.Indexer.UI.Operacao'     xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'     xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'     xmlns:tci='clr-namespace:TCI.Indexer.UI.Controles'     Title=' ' MinHeight='550' MinWidth='675' Loaded='Load' ResizeMode='NoResize' WindowStyle='None' WindowStartupLocation='CenterScreen' WindowState='Maximized' Focusable='True'     x:Name='windowOperacao'>     <Canvas x:Name='canv'>         <Grid>             <tci:Status x:Name='ucStatus'/> <!-- the control which I want to stretch in width -->         </Grid>     </Canvas> </Window> 

Answer 1

You need to make sure your usercontrol hasn’t set it’s width in the usercontrol’s xaml file. Just delete the Width=’…’ from it and you’re good to go!

EDIT: This is the code I tested it with:

SOUserAnswerTest.xaml:

<UserControl x:Class='WpfApplication1.SOAnswerTest'     xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'     xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'     Height='300'>     <Grid>         <Grid.ColumnDefinitions>             <ColumnDefinition Name='LeftSideMenu' Width='100'/>             <ColumnDefinition Name='Middle' Width='*'/>             <ColumnDefinition Name='RightSideMenu' Width='90'/>         </Grid.ColumnDefinitions>         <TextBlock Grid.Column='0'>a</TextBlock>         <TextBlock Grid.Column='1'>b</TextBlock>         <TextBlock Grid.Column='2'>c</TextBlock>     </Grid> </UserControl> 

Window1.xaml:

<Window x:Class='WpfApplication1.Window1'     xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'     xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'     xmlns:local='clr-namespace:WpfApplication1'     Title='Window1' Height='300' Width='415'>     <Grid>          <local:SOAnswerTest Grid.Column='0' Grid.Row='5' Grid.ColumnSpan='2'/>     </Grid> </Window>