How to remove all handler from an event of form using VB.NET?

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I am working on a window application (written using Vb.net).In the main form Load event another form 'frmcrew_managment' is also loaded.In this stage for RefreshClick event of Main form attaches 'Refreshadata' method ( handler) of 'frmcrew_managment' . As a result after the main form is loaded it's RefreshClick Event has the address of method of 'frmcrew_managment'. Now in the main form one of Menu options is OpenAdjustment (frmOpenAdjustment ) . So onclick of OpenAdjustment option, in it's form load (for frmOpenAdjustment ) I need to attach RefreshGriddata Method (of frmOpenAdjustment) to RefreshClick event of Main Form sothat when user clicks Refresh on main screen RefreshGriddata Method of frmOpenAdjustment is called. But now what is happening Refreshadata of frmcrew_managment is also getting called. So to solve this I need to remove all event handler from RefreshClick event of main Form before adding event handler RefreshGriddata of frmOpenAdjustment . So what is the way to removed all event handler from an event (RefreshClick )of main form?

here requirement is that by default in all cases Refreshclick of main form should be handled by Refreshadata of frmcrew_managment but when frmOpenAdjustment is loaded from menu option Refreshclick of main form should be handled by RefreshGriddata of frmOpenAdjustment

What I have tried:

Private _parent As frmMainAlt
Private _Me As frmOpenAdjustmentsAlt
Private _crewMgt As frmCrewManagement

_parent = parent


RemoveHandler _parent.RefreshClick, AddressOf _crewMgt.RefreshData

AddHandler _parent.RefreshClick, AddressOf refreshgrid