#1,071 – How TextBox Reacts to Gaining Keyboard Focus

If you have an application with several TextBox controls, you’ll notice that the TextBox that currently has focus “lights up” by drawing a light blue border around the edge of the TextBox.

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The TextBox draws the blue border by setting up a trigger in its control template.  You can see the body of the control template by right-clicking the TextBox in Visual Studio from the design surface and selecting Edit Template, followed by Edit a Copy.

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When you do this, you’ll be asked to give the new copy a name (e.g. TextBoxStyle1).  You’ll then get the full body of the template in the XAML document.

Looking at this template, you’ll see a Trigger on the IsKeyboardFocused property that sets the value of the BorderBrush on a Border element.  It sets it to a static resource, which is defined earlier in the template (to a light blue color).

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About Sean
Software developer in the Twin Cities area, passionate about .NET technologies. Equally passionate about my own personal projects related to family history and preservation of family stories and photos.

One Response to #1,071 – How TextBox Reacts to Gaining Keyboard Focus

  1. Pingback: Dew Drop – May 13, 2014 (#1775) | Morning Dew

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