How to make my control focusable? - wpf

Question

I have a control
public class FocusTestControl : Control {
public FocusTestControl() {
DefaultStyleKey = typeof(FocusTestControl);
}
}
Here is it's default style
<Style
TargetType="local:FocusTestControl">
<Setter
Property="Focusable"
Value="True" />
<Setter
Property="Template">
<Setter.Value>
<ControlTemplate>
<Grid>
<Border
Background="AliceBlue" />
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
I put this control on a window:
<Window
x:Class="MakeWpfControlFocusable.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:MakeWpfControlFocusable"
Title="MainWindow"
Height="350"
Width="525">
<Grid>
<Grid.RowDefinitions>
<RowDefinition />
<RowDefinition
Height="35" />
</Grid.RowDefinitions>
<local:FocusTestControl />
<StackPanel
Grid.Row="1"
Orientation="Horizontal">
<TextBlock
Text="Focused element: " />
<TextBlock
Text="{Binding RelativeSource={RelativeSource AncestorType={x:Type Window}}, Path=KeyboardFocusedElement}" />
<TextBox
Text="Text" />
</StackPanel>
</Grid>
But clicking on control doesn't make it focused (I mean KebordFocus)
Actually, my task is handle the KeyDown and KeyUp events. But it is impossible when element has no keybord focus.

Answer 1

Keybord focus can be set by pessing Tab keyboard key. But is is not set when click on the control. I've subscribed to the MouseDown event and set focus manually in the handler.
public class FocusTestControl : Control, IInputElement {
public FocusTestControl() {
DefaultStyleKey = typeof(FocusTestControl);
MouseDown += FocusTestControl_MouseDown;
}
void FocusTestControl_MouseDown(object sender, System.Windows.Input.MouseButtonEventArgs e) {
Keyboard.Focus(this);
}
}