Function start_column 

pub fn start_column(child: impl IntoUiNode, cell: impl IntoUiNode) -> UiNode

P Sets the content to the Align::START side of the button menu item.

The cell is an non-interactive background that fills the START_COLUMN_WIDTH_VAR and button height.

This is usually an icon, or a checkmark.

See also start_column_fn for use in styles.