Chang SelectionFilter during GetSelection

hi every one

i added an keyword with GetSelection  using PromptSelectionOptions , this keyword can detrimne ablock name after run my selection

Dim AcSelResult As PromptSelectionResult = Application.DocumentManager.MdiActiveDocument.Editor.GetSelection(AcSelOption, AcSelFtr)

 now how can i reload my selection by new block name , without end command

cause my current selection take old selection filter ,

i hope you understand me