WM_USER_DBLCLK
From OllyDbg Plugin API
When user doubleclicks left mouse button within the data area (but neither in bar nor over the dividing line), table window receives this message. HIWORD(wParam) contains column, LOWORD(wParam) - X offset within the column in character widths, lParam - Y offset within the window in rows. If window processes this message, it must return 1, otherwise doubleclick is treated as simple click.