SMART datagrid v.1 > Classes > GridBase
The number of top Columns which is displayed in the current grid.
You can know the number of all top columns which include the columns not being displayed through columnCount.
for (var i = 0, cnt = grid.visibleColumnCount(); i < cnt; i++) {
var col = grid.getVisibleColumn(i);
col && col.setWidth(col.width() + 10));
}