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Specifies the prefix of a Tcl command to invoke to change the view in the widget associated with the scrollbar. When a user requests a view change by manipulating the scrollbar, a Tcl command is invoked. The actual command consists of this option followed by a space and a number. The number indicates the logical unit that should appear at the top of the associated window.
Specifies the desired narrow dimension of the scrollbar window, not including 3-D border, if any. For vertical scrollbars this will be the width and for horizontal scrollbars this will be the height. The value may have any of the forms acceptable to Tk_GetPixels.
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