Gets the maximum value for the spin box (also known as an up-down control).
Returns
The maximum value for the spin box. The default value is 100.
Remarks
When the maximum property is set, the minimum property is evaluated and the update_edit_text method is called. If the minimum property is greater than the new maximum property, the minimum property value is set equal to the maximum value. If the current Value is greater than the new Maximum value. the value property value is set equal to the maximum value.