+ /// <summary>
+ /// Sets or Gets the size proportion of the Panes widget's left side.
+ /// </summary>
+ /// <remarks>
+ /// By default it's homogeneous, i.e., both sides have the same size.If something different is required,
+ /// it can be set with this function. For example, if the left content should be displayed over 75% of the panes size,
+ /// size should be passed as 0.75. This way, the right content is resized to 25% of the panes size.
+ /// If displayed vertically, left content is displayed at the top, and right content at the bottom.
+ /// This proportion changes when the user drags the panes bar.
+ ///
+ /// The value is float type and between 0.0 and 1.0 representing the size proportion of the left side.
+ /// </remarks>