• True if the modification was performed,
• False otherwise.

Rank of the button to modify (included between 1 and 7). When adding a button, SysThumbnailAddButton returns the rank of the added button.

Path of icon file to display. This file can be found on the disk or in the application library (WDL file). If this parameter is not specified, the icon will not be modified.

Remarks:

• If the icon used is not in 16x16 format, it will be automatically resized by Windows.
• The following image formats are supported in Windows:
  • Bitmap (*.BMP)
  • Graphics Interchange Format (*.gif)
  • Joint Picture Experts Group (*.jpg ; *.jpeg)
  • Kodak Photo CD (*.pcd)
  • PaintBrush (*.pcx)
  • Adobe Photoshop Format (*.psd)
  • TrueVision TARGA (*.tga)
  • Tagged Image File Format (*.tif ; *.tiff)
    Remark: the "tiled tiff" option of tiff 6.0 standard is not supported. In this case, we advise you to save the image in tiff 5.0 standard.
  • Portable Network Graphics (*.png)
  • Windows MetaFiles (*.emf ; *.wmf)
  • Icons (*.ico ; *.icw)
    
    Versions 22 and later
    Remarks:

    • HQ display (High Quality) available.
    • Management of sheets in transparent BMP format (32 bits).
    New in version 22
    Remarks:

    • HQ display (High Quality) available.
    • Management of sheets in transparent BMP format (32 bits).
    Remarks:
    • HQ display (High Quality) available.
    • Management of sheets in transparent BMP format (32 bits).
  • Cursors (*.cur)
  • Portable Document Format (*.pdf)
  • Versions 15 and later
    Scalable Vector Graphics (*.svg)
    New in version 15
    Scalable Vector Graphics (*.svg)
    Scalable Vector Graphics (*.svg)
  • Versions 22 and later
    WINDEV images (generated by the image editor, *.WDPIC).
    New in version 22
    WINDEV images (generated by the image editor, *.WDPIC).
    WINDEV images (generated by the image editor, *.WDPIC).

Text of the rollover tooltip of the button.
If this parameter is not specified, the text of the tooltip is not modified.
If this parameter corresponds to an empty string (""), the previous tooltip will be erased.

Name of WLanguage procedure called during a click on the button.
No procedure will be started if this parameters corresponds to an empty string ("").
If this parameter is not specified or if it is equal to Null, the name of the procedure will not be modified.

Management mode of button. The available constants are as follows:

sysbtnActive (Default value)	The button is active.
sysbtnCloseThumbnail	Clicking the button closes the thumbnail of the application.
sysbtnGrayed	The button is grayed.
sysbtnInactive	The button cannot be clicked (this constant can be used only when the button is used as notification icon).
sysbtnInvisible	The button is invisible (its location is empty in the button bar).
sysbtnNoBackground	Only the button icon is drawn (not the button border). This constant can be used when the icon contains the border drawing.

If this parameter is not specified, the options remain identical to the ones defined by SysThumbnailAddButton.