Progress bar with Cancel button on Unity Editor Window

Dear Members,

I have to create a progress bar which is dynamically updated and a cancel button on Unity Editor Window. When Cancel button is clicked the progress bar stops and action aborts.

I am using

EditorGUI.ProgressBar(rect(x,y,w,h), barVal, ""); //for progress bar

and

If(GUI.Button(Rect(x,y,w,h), "Cancel")) {

//Need action to stop progress bar and abort all action?????

} //to create cancel button.

Please help me to be able to cancel progress bar and abort actions when cancel button is clicked.

Thanks & regards, Anoop