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Message	Wrapper macro	Description
WM_GETFONT		Font handle to use for the text
WM_SETFONT
WM_GETICON		Icon handle (optional)
WM_SETICON
CM_GETANCHOR	Callout_GetAnchor(hwnd)	Position of anchor in client coordinates
CM_SETANCHOR	Callout_SetAnchor(hwnd, x, y)
CM_GETBACKCOLOR	Callout_GetBackColor(hwnd)	Color of interior of balloon
CM_SETBACKCOLOR	Callout_SetBackColor(hwnd, Color, Repaint)
CM_GETBORDER	Callout_GetBorder(hwnd)	Border thickness
CM_SETBORDER	Callout_SetBorder(hwnd, Width, Repaint)
CM_GETDRAWTEXTPROC	Callout_GetDrawTextProc(hwnd)	Text drawing function to replace DrawText()
CM_SETDRAWTEXTPROC	Callout_SetDrawTextProc(hwnd, Proc, Repaint)
CM_GETEXTRAHEIGHT	Callout_GetExtraHeight(hwnd)	Extra height of balloon text box
CM_SETEXTRAHEIGHT	Callout_SetExtraHeight(hwnd, Height, Repaint)
CM_GETMINWIDTH	Callout_GetMinWidth(hwnd)	Minimum width of balloon text box
CM_SETMINWIDTH	Callout_SetMinWidth(hwnd, Width, Repaint)
CM_GETRADIUS	Callout_GetRadius(hwnd)	Radius of rectangle rounding
CM_SETRADIUS	Callout_SetRadius(hwnd, Radius, Repaint)
CM_GETRECT	Callout_GetRect(hwnd)	Position and size of balloon text box
CM_GETTAILHEIGHT	Callout_GetTailHeight(hwnd)	Height of tail in pixels
CM_SETTAILHEIGHT	Callout_SetTailHeight(hwnd, Height, Repaint)
CM_GETTAILJOIN	Callout_GetTailJoin(hwnd)	Horizontal position where tail joins balloon; a percentage of the balloon width
CM_SETTAILJOIN	Callout_SetTailJoin(hwnd, Join, Repaint)
CM_GETTAILOFFSET	Callout_GetTailOffset(hwnd)	Vertical offset of tail to anchor point
CM_SETTAILOFFSET	Callout_SetTailOffset(hwnd, Offset, Repaint)
CM_GETTAILSLANT	Callout_GetTailSlant(hwnd)	Tail slant (tangent of the angle); a negative value slants to the left
CM_SETTAILSLANT	Callout_SetTailSlant(hwnd, Slant, Repaint)
CM_GETTAILSTYLE	Callout_GetTailStyle(hwnd)	Tail style: CS_SPEAK or CS_THINK
CM_SETTAILSTYLE	Callout_SetTailStyle(hwnd, Style, Repaint)
CM_GETTAILWIDTH	Callout_GetTailWidth(hwnd)	Width of the tail where it joins the balloon
CM_SETTAILWIDTH	Callout_SetTailWidth(hwnd, Width, Repaint)
CM_GETTEXTCOLOR	Callout_GetTextColor(hwnd)	Color of the text and border of the callout
CM_SETTEXTCOLOR	Callout_SetTextColor(hwnd, Color, Repaint)
CM_GETTIMEOUT	Callout_GetTimeout(hwnd)	Timeout in milliseconds; 0 = no timeout
CM_SETTIMEOUT	Callout_SetTimeout(hwnd, Timeout)
CM_GETVERTALIGN	Callout_GetVertAlign(hwnd)	Alignment of callout relative to the anchor point: CS_ALIGNABOVE or CS_ALIGNBELOW
CM_SETVERTALIGN	Callout_SetVertAlign(hwnd, Alignment, Repaint)

Table 1: An overview of the standard and custom messages that you can send to the callout control.

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