Best Practice: Always check for Control disposed in Display.asyncExec()

Display.getDefault().asyncExec(new Runnable()

{

public void run()

{

//Always check for whether the control is disposed.

if (!progressComposite.isDisposed())

{

//perform UI operation.

}

}

});

Reason being, when we say asyncExec thread - it will execute on the next reasonable opportunity. But by that time the control would have been disposed.