How to dock a Tab Control in WPF

Unlike Windows Forms controls, the WPF controls do not have Dock properties. To dock to fill a Tab Control on a Grid, you just need to remove Width, Height, and Alignment properties of a control.

Here is a window where a Tab control is filled on a Grid panel.

Here is the code snippet. You drag and drop a TabControl on the window and remove its Width, Height and alignment properties.

<Grid Background="LightBlue">
        <TabControl Name="tabControl1" >
            <TabItem Header="tabItem1" Name="tabItem1">
                <Grid />
            </TabItem>

            <TabItem Header="tabItem2" Name="tabItem2">
                <Grid />
            </TabItem>

            <TabItem Header="tabItem3" Name="tabItem3">
                <Grid />
            </TabItem>
        </TabControl>
    </Grid>

Here are some more related articles.

DockPanel in WPF

WPF Controls,Layout panel and Graphics primitives

Canvas in WPF

Grid in WPF

WrapPanel in WPF

Cheers!