OpenForPanel - A "hook" type function that gets called shortly after creation (and after the above 2) to open and position the tooltip. You can see this logic in lua/includes/util/tooltips.lua.
Example
Create a custom drawn tooltip.
local PANEL ={}functionPANEL:Paint( w, h )
-- My fancy white backgrounddraw.RoundedBox( 5, 0, 0, w, h, Color( 255, 255, 255, 255 ) )
endvgui.Register( "MyCustomTooltipPanel", PANEL, "DTooltip" )
concommand.Add( "test_custom_tooltip", function( ply )
local DFrame =vgui.Create( "DFrame" )
DFrame:SetSize( 200, 200 )
DFrame:Center()
DFrame:MakePopup()
local btn =DFrame:Add( "DButton" )
btn:SetPos( 20, 40 )
btn:SetSize( 100, 64 )
btn:SetText( "Hover over me!" )
btn:SetTooltip( "I am the tooltip text with a custom panel!" )
btn:SetTooltipPanelOverride( "MyCustomTooltipPanel" )
end )
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