ButtonOpen SUB

 Action
 Opens a button of the specified type, and places it in the current window at
 the window coordinates specified.


 Syntax
 ButtonOpen handle%, state%, text$, row1%, col1%, row2%, col 2%, buttonType%

 Remarks
 Use ButtonOpen when you want to place any kind of buttons in open windows.
 The ButtonOpen procedure uses the following arguments.

 handle%
 -------
 An integer that indicates the number of the button that is being opened.
 This can be any number between 1 and the value declared in the constant
 MAXBUTTON, inclusive.

 state%
 ------
 An integer that indicates the initial state of the button that is being
 opened. For each different button type and state% value, the following
 applies.

 Type     Value   Significance

 1          1     Normal.
            2     Default choice (brackets highlighted).
            3    Chosen (highlighted in reverse video).

 2 & 3      1     Normal.
            2     Selected (checked).

 4          0     Does not apply to type 4 (area button).
 5                Reserved for future use.

 6 & 7      n     Indicates the initial position of the scroll bar's position
 indicator. It can be between 1 and the maximum position.

 text$
 -----
 A string that contains the text to be displayed in the button. Does not
 apply to button types 4, 6, or 7.

 row1%, col1%
 ------------
 An integer pair that describes the upper-left corner of an area relative to
 the upper-left corner of the current window, not the screen.

 row2%, col 2%
 -------------
 An integer pair that specifies the lower-right corner of an area, relative
 to the upper-left corner of the current window, not the screen. The
 coordinates row2% and col 2% apply only to button types 4, 6, and 7. Any
 values in these arguments are ignored by other button types; however,
 arguments must be in the argument list, even if their value is 0.

 buttonType%
 -----------
 An integer that indicates the type of button to be opened. The following is
 a list of valid button types.
     1     Command button
     2     Check box
     3     Option button
     4     Area button
     5     Reserved for future use
     6     Vertical scroll bar
     7     Horizontal scroll bar

 Note that the positioning coordinates are relative to the current window,
 not absolute from the top-left corner of the screen. Within each window,
 each button has a unique handle% value. Because buttons are local to
 specific windows it is permissible to have more than one button with the
 same handle% value, provided they are in different windows.

 See Also.  ButtonClose