local Background = CreateFrame('Button', name, UIParent)

...

    Background:EnableMouse(true)
    --Background:SetMovable(true)
    --Background:RegisterForDrag('LeftButton')
    --Background:SetScript('OnDragStart', function() if IsAltKeyDown() then self.frames[u]:StartMoving() end end)
    --Background:SetScript('OnDragStop', function() self.frames[u]:StopMovingOrSizing() self:savePosition() end)
    Background:SetScript('OnEnter', function() UnitFrame_OnEnter() end)
    Background:SetScript('OnLeave', function() UnitFrame_OnLeave() end)
    Background:RegisterForClicks('LeftButtonUp','RightButtonUp','MiddleButtonUp','Button4Up','Button5Up')
    Background:SetScript('OnClick', self.OnClick)

...

function idUnitframes:OnClick()
    local b,u = arg1, this.unit

    if not UnitExists(u) then return end
    if UnitIsUnit(u, 'player') then u = 'player' end

    if b == 'LeftButton' then
        if SpellIsTargeting() then
            SpellTargetUnit(u)
        elseif CursorHasItem() then
            if UnitIsUnit(u, 'player') then
                AutoEquipCursorItem()
            elseif UnitIsFriend(u, 'player') and UnitIsPlayer(u) then
                DropItemOnUnit('target')
            end
        else
            TargetUnit(u)
        end
    elseif b == 'RightButton' then
        u = oUF:strcap(u)
        if string.find(u,'Party') then
            ToggleDropDownMenu(1, nil, getglobal('PartyMemberFrame'..this:GetID()..'DropDown'), 'cursor', 0, 0)
        else
            ToggleDropDownMenu(1, nil, getglobal(u..'FrameDropDown'), 'cursor', 0, 0)
        end
    end
end