Quoted from SPDiary.
| "Regular" mode | "ToolPane" mode |
| New | New |
| On Init | On Init |
| On Load | CreateChildControls |
| CreateChildControls | On Load |
| GetToolParts | |
| On PreRender | On PreRender |
| RenderWebPart | RenderWebPart |
I think it's useful because I met the same problem before:)