How to create and apply a resource
Styles and templates for elements are stored in reusable entities called resources. Styles enable you to set element properties and reuse those settings for a consistent appearance across multiple elements. A ControlTemplate defines the appearance of a control and can also be applied as a resource. For more info, see Quickstart: styling controls and QuickStart: control templates.
Whenever you create a new resource from an existing property, Style, or ControlTemplate, the Create Resource dialog box enables you to define the resource at the application level, the document level, or the element level. These levels determine where you can use the resource. For example, if you define the resource at the element level, the resource can be applied only to the element on which you created it. You can also choose to store the resource in a resource dictionary, which is a separate file that you can use again in another project.
To create a new resource
With a XAML file open in the XAML Designer, create an element or select an element in the Document Outline window.
In the Properties window, click the property marker to the right of a property value, which appears as a box symbol, and then click Convert to New Resource. A white box symbol indicates a default value, and a black box symbol typically indicates that a local resource has been applied
The appropriate dialog box for creating a resource appears. This dialog box appears when you create a resource from a brush:
.png "Create Resource Dialog Box")
In the Name (Key) box, enter a key name. This is the name that you can use when you want other elements to reference the resource.
Under Define in, click the option that specifies where you want the resource to be defined:
To make the resource available to any document in your application, click Application.
To make the resource available to only the current document, click This document.
To make the resource available to only the element from which you created the resource or to its child elements, click This document, and in the drop-down list, select element: name.
To define the resource in a resource dictionary file that can be reused in other projects, click Resource dictionary, and then select an existing resource dictionary file, such as StandardStyles.xaml, in the drop-down list.
Click OK to create the resource and apply it to the element from which you created it.
To apply a resource to an element or property
In the Document Outline window, select the element that you want to apply a resource to.
Do one of the following:
Apply a resource to a property. In the Properties window, click the property marker next to the property value, point to Local Resource or System Resource, and then click an available resource from the list that appears.
If you don't see a resource that you expect to see, it might be because the type of the resource doesn’t match the type of the property.
Apply a style or control template resource to a control. Right-click a control in the Document Outline window, point to Edit Template or Edit Additional Templates, point to Apply Resource, and then click the name of the control template from the list that appears.
Note
Edit Template is used to apply control templates. Edit Additional Templates is used to apply other template types.
Resources can be applied wherever they're compatible. For example, a brush resource can be applied to the Foreground property of a TextBox control.
To edit a resource
Select an element on the artboard or in the Document Outline window.
Click the Default or Local property marker to the right of the property in the Properties window, and then click Edit Resource to open the Edit Resource dialog box.
Modify options for the resource.