When writing code for event handlers, it is sometimes necessary to include the namespace in which specific elements reside. Here are the elements found in the System.Windows.Controls namespace:
Border
Button
Canvas
CheckBox
ColumnDefinition
ColumnDefinitionsCollection
ComboBox
ComboBoxItem
ContextMenu
DockPanel
DocumentViewer
Expander
Frame
Grid
HorizontalSlider
Image
Label
ListBox
ListBoxItem
MediaElement
Menu
MenuItem
Page
Panel
PasswordBox
RadioButton
RadioButtonList
RichTextBox
RowDefinition
ScrollViewer
TabControl
TabItem
TextBlock
TextBox
TextSearch
ToolBar
ToolBarOverflowPanel
ToolBarPanel
ToolBarTray
ToolTip
VerticalSlider
Viewbox
Viewport3D