The structure of controls that are incorporated is shown below In the XAML above you can see we create custom control templates for ComboBoxItem, ToggleButton and for whole ComboBox. TextBox here is visible when the combo box is in editable mode. It is built on grid and contains ToggleButton, ContentPresenter, TextBox. In line 22 you can see the style and control template for the combo box itself. The ComboBoxItem template contains some triggers which changes the colors of highlighted items. In our case it consists of two borders, one includes whole content and the second includes the text box only, and the path geometry which draws the arrow. starts the control template for the ToggleButton which is the main container for combo box and all controls that can change its state. We must override all control styles since we want to change the shape of the arrow and thus change the look of the toggle button of the combo box. It means that our combo box will not use standard theme style properties, but all style properties will come from styles provided by us. Indicates that we are going to totally override the default style. LinearGradientBrush might not have the most obvious syntax, so I will explain that in a later chapter, including other brush types, but for now, you can In this case, I've specified a LinearGradientBrush to be used for the background of the Border and then a more fitting border color. Simple color as the background, but you can actually use gradients as well, and it's not even that hard to do:

As seen in the initial examples, it's very easy to just use a The Background property is of the type Brush, which opens up a lot of cool possibilities. Because the BorderThickness property is of the Thickness type, you can even manipulate each of the border widths individually or by giving a value for the left and right and one for the The above border is very discrete, but this can easily be changed by regulating the color and/or thickness. Like I did in the example here, where I specify separate values for the top right and left followed by the bottom right and left. It can be specified with a single value, which will be used for all four corners, or Just look at this slightly modified example,ДЄll I've done is adding the CornerRadius property. One of the features I really appreciate about the Border is the fact that it's so easy to get round corners. The Border is completely lookless until you define either a background or a border brush and thickness, so that's what I've done here, using the Background, BorderBrush and BorderThickness properties. a Panel with the Border control.ДЄ simple example on using the Border as described above could look like this: Support drawing a border around its edges, the Border control can help you achieve just that, simply by surrounding e.g. The Border control is a Decorator control that you may use to draw a border, a background, or even both, around another element.

Wpf add border to text box