Gets or sets whether an editor is checked. This is a dependency property.
A Boolean value (that can also have a value of null) that specifies the editor's state.
A toggle switch editor supports three states (checked, unchecked and intermediate) if its ToggleSwitchEdit.IsThreeState property is set to true. Otherwise, if this property is set to false, only checked and unchecked states are supported.
Use the IsChecked property to specify the editor's state. To set the editor to the intermediate state (if supported), set the IsChecked property to null.