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[This documentation is for preview only, and is subject to change in later releases. Blank topics are included as placeholders.]
Pushes the specified undo unit onto the undo stack.
Namespace:  Microsoft.VisualStudio.GraphModel
Assembly:  Microsoft.VisualStudio.GraphModel (in Microsoft.VisualStudio.GraphModel.dll)
Syntax
'Declaration
Protected MustOverride Sub Add ( _
    undo As T _
)
protected abstract void Add(
    T undo
)
protected:
virtual void Add(
    T undo
) abstract
abstract Add : 
        undo:'T -> unit
protected abstract function Add(
    undo : T
)
Parameters
- undo 
 Type: T- Undo unit to push. 
.NET Framework Security
- Full trust for the immediate caller. This member cannot be used by partially trusted code. For more information, see Using Libraries from Partially Trusted Code.