This property allows you to group several cells on the x-axes in the column heading.

The value of this property specifies how many cells should be merged together on the x-axes starting from the column identified by the X property in the row identified by the Y property. The row must be part of the column heading.

It is a virtual join that the runtime simulates by hiding the vertical border. The number of columns doesn’t change for the program.

 

Example - In a grid where the first three rows are column headings, merge column number 2 and 3 within the second row