FixedSize Control Attribute
If the FixedSize Control bit is set, the picture is cropped or centered in the control without changing its shape or size.
If this bit is not set the picture is stretched to fit the control.
To set this attribute on a control, include the FixedSize bit in the Attributes column of the control's record in the Control table.
Setting the FixedSize bit has no effect on an Icon control, or a PushButton associated with an icon, if the IconSize bits is not set.