controls whether or not the column's width is fixed or not.
If this is true, the user can interactively change the column's width. Also, the column is subject to
auto-resizing, if its Flexibility attribute is greater 0.
specifies the flexibility of the column when it is automatically resized due to the grid control as a whole
being resized.
Specify 0 here if you do not want the column to be resized automatically.
If a column has a flexibility greater than 0, it is set in relationship to the flexibility of all
other such columns, and the respective widths of the columns are changed in the same relationship.
Note that a column's flexibility is ignored if its Resizeable attribute is
false.
A column's flexibility cannot be negative, attempts to set a negative value will raise an exception.
denotes the index of the data column which should be used to fetch this grid column's data
A grid control has a column model and a data model, both containing a possibly different number of columns.
The DataColumnIndex attribute defines the index of the column within the data model, which should
be used to retrieve actual data.
Using this, you can do runtime changes to the column model, i.e. insertion and removal of columns, without
necessarily needing to adjust the data model, too.
If DataColumnIndex is negative, the it will be ignored, then the column's index within its
column model, as determined by the Index attribute, will be used.
