Reset a property to its default value
Resetting a property to its default value is useful if you want to use the default value of the object type. For example, if you convert a canvas panel to a grid panel, you might want to reset the Layout properties to the defaults that are used by a grid. Using default values reduces the size of your XAML files because default properties do not have to be specified as XAML attributes.
To reset a property
In the Properties panel, locate the property that you want to reset.
Next to the property, click Advanced options . The color of the marker depends on what the property was set to. For example, a yellow marker means that the property was data bound.
On the shortcut menu that appears, click Reset.
The value field is updated to show you the default property value.