The Add method of Grid.ColumnDefinitions adds a new column
to Grid.
DynamicGrid.ColumnDefinitions.Add(new ColumnDefinition());
The Grid.ColumnDefinitions.Insert method adds a column at a
given position. The following code adds a new column at position 3 in a Grid.
DynamicGrid.ColumnDefinitions.Insert(3, new ColumnDefinition());
The RemoveAt method of Grid.ColumnDefinitions deletes a
column at the given position.
DynamicGrid.ColumnDefinitions.RemoveAt(3);
The Clear method of Grid.ColumnDefinitions deletes all
columns in a Grid.
DynamicGrid.ColumnDefinitions.Clear();