c# - Transparency on Windows embedded desktop -


i developing application windows embedded compact 7. 1 of requirements program round button lying on top of other controls (e.g. grid or list).

it seems me, not possible in .net framework, desktop icons provide transparency, on top other icons.

why , can use transparency in c# in anyway?

sorry missing information: develop in c#, .net 3.5, 2 arm processors, 500 mhz, 1 ghz, use resco components, , support transparency against background. say, system.windows.forms.control not support transparency.

just copy following code , , paste . make 1 command button or label or else. background transparent command buttons shown.

   option explicit    private declare function createrectrgn lib _    "gdi32" (byval x1 long, byval y1 long, _    byval x2 long, byval y2 long) long    private declare function combinergn lib _    "gdi32" (byval hdestrgn long, byval hsrcrgn1 long, _    byval hsrcrgn2 long, byval ncombinemode long) long    private declare function setwindowrgn lib _    "user32" (byval hwnd long, byval hrgn long, _    byval bredraw boolean) long    private declare function deleteobject lib _    "gdi32" (byval hobject long) long     ' constants used combinergn function    private const rgn_and = 1    private const rgn_or = 2    private const rgn_xor = 3    private const rgn_diff = 4    private const rgn_copy = 5     private sub form_activate()    dim rgnform long, rgncombined long    dim rgncontrol long, x long    dim formwidth single, formheight single    dim borderwidth single, titleheight single    dim ctlleft single, ctltop single    dim ctlwidth single, ctlheight single    dim ctl control     ' calculate form area    borderwidth = (me.width - me.scalewidth) / 2    titleheight = me.height - me.scaleheight - borderwidth    ' convert pixels    borderwidth = scalex(borderwidth, vbtwips, vbpixels)    titleheight = scaley(titleheight, vbtwips, vbpixels)    formwidth = scalex(me.width, vbtwips, vbpixels)    formheight = scaley(me.height, vbtwips, vbpixels)     ' create region whole form    rgnform = createrectrgn(0, 0, formwidth, formheight)     rgncombined = createrectrgn(0, 0, 0, 0)    ' make graphical area transparent combining 2 regions    x = combinergn(rgncombined, rgnform, rgnform, rgn_diff)     ' make controls visible    each ctl in controls    ' make regions of controls container form visible    if typeof ctl.container form    ctlleft = scalex(ctl.left, vbtwips, vbpixels) + borderwidth    ctltop = scalex(ctl.top, vbtwips, vbpixels) + titleheight    ctlwidth = scalex(ctl.width, vbtwips, vbpixels) + ctlleft    ctlheight = scalex(ctl.height, vbtwips, vbpixels) + ctltop    rgncontrol = createrectrgn(ctlleft, ctltop, ctlwidth, ctlheight)    x = combinergn(rgncombined, rgncombined, rgncontrol, rgn_or)    end if    next ctl      ' set clipping area of window using resulting region    setwindowrgn hwnd, rgncombined, true    ' tidy    x = deleteobject(rgncombined)    x = deleteobject(rgncontrol)    x = deleteobject(rgnform)   end sub

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