Grid container used to arrange elements in a grid like layout. Grid container will arrange its children in a grid like structure, the grid columns are specified using the [member columns] property and the number of rows will be equal to the number of children in the container divided by the number of columns. For example, if the container has 5 children, and 2 columns, there will be 3 rows in the container. Notice that grid layout will preserve the columns and rows for every size of the container, and that empty columns will be expanded automatically. The number of columns in the [GridContainer]. If modified, [GridContainer] reorders its children to accommodate the new layout.