Windows Forms Controls in VSTO

VSTO contains two namespaces that hold classes that contain Windows Forms controls, which you can use on the Word documents or Excel worksheets. All controls in the Microsoft.Office.Tools.Word.Controls and Microsoft.Office.Tools.Excel.Controls namespaces are derived from the Windows Forms base classes and function in the same way as regular Windows Forms controls.

You can find the following controls in the Microsoft.Office.Tools.Word.Controls namespace:

Button	HScrollBar	MonthCalendar	RichTextBox
CheckBox	Label	NumericUpDown	TextBox
CheckedListBox	LinkLabel	PictureBox	TrackBar
ComboBox	ListBox	ProgressBar	TreeView
DataGridView	ListView	PropertyGrid	VScrollBar
DateTimePicker	MaskedTextBox	RadioButton	WebBrowser
DomainUpDown

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Source:http://www.dummies.com/how-to/content/windows-forms-controls-in-vsto.html