Language Reference Guide : 4. System Classes : FrameSource Class : MainBarLeft Attribute
 
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MainBarLeft Attribute
Data Type: array of MainBar
4GL Access: RW
The MainBarLeft attribute contains the set of MainBar items that are attached to the left side of the frame's form. The items in the array are displayed from left to right. For an example, see MainBar Class.
The Orientation attribute of the MainBar items in this array should be set to FO_VERTICAL (see Orientation Settings for TableField, StackField, SliderField, ScrollbarField, RadioField, and PaletteField).
Note:  After setting this attribute, the array referenced by this attribute may differ from the one you set it to.