To specify whether check boxes should be displayed, use the ShowCheckBoxes property in the WinExplorerView.OptionsView section. To set a column that will populate a Check Box field for this WinExplorerView, use the WinExplorerViewColumns.CheckBoxColumn property. You can also set margins for the entire WinExplorerView item via the ContentMargins property.
See the WinExplorer View topic for details.