Button Handler ButtonStates

[Baumkuchen3]

1.
I want to remove the setted Handler within the "OnClicked" event. How can I do this. I dont know witch parameters the "function(.....) " (the 2. parameter of "button:SetHandler()" can use and how to access the button itself. "self" does not work here.

My Example function --- which will set the button handler:

function addon.InitControls(rowNumber)

 deleteButton:SetHandler("OnClicked", function(self) <-- are there other parameter available?
        
    DoSomethingt(rowNumber)

    self:RemoveHandler ("OnClicked") <-- how to remove the handler?

end)

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2. How to Change the Button State in Code. I know hot to hide a control

deleteButton:SetHidden(true)

But I also want to disable a control/button.