The styles of the tree control are controlled by style flags. The user can modify the styles at run time.
| Tree Control Style Flag | Description |
| TVS_DISABLEDRAGDROP | Prevents the tree view control from sending TVN_DRAGDROP notification messages. |
| TVS_EDITLABELS | Allows the user to edit the labels of tree view items. |
| TVS_HASBUTTONS | Displays plus (+) and minus (-) buttons next to parent items. The user clicks the buttons to expand or collapse a parent item's list of child items. To include buttons with items at the root of the tree view, you need to specify TVS_LINESATROOT. |
| TVS_HASLINES | Uses lines to show the hierarchy of items. |
| TVS_LINESATROOT | Uses lines to link items at the root of the tree view control. This value is ignored if TVS_HASLINES is not also specified. |
| TVS_SHOWSELALWAYS | Causes a selected item to remain selected when the tree view control loses focus. |
| TVXS_COLUMNHEADER | Displays the column header. This style removes the LVS_NOCOLUMNHEADER style so that all the columns display headers. |
| TVXS_FLYBYTOOLTIPS | Enable tooltips. |
| TVXS_MULTISEL | Enables the user to select multiple items. |
| TVXS_WORDWRAP | Enables word wrapping of text if the first column is narrow. Specifying this style automatically enables the LVXS_WORDWRAP style, affecting all columns. |
| LVS_SINGLESEL | Disables multiple selection of items. |
| LVXS_FITCOLUMNSONSIZE | The item column fills the width not occupied by subitem columns. |
| LVXS_FLYBYTOOLTIPS | Enable tooltips for additional columns. The TVXS_FLYBYTOOLTIPS style automatically enables this style. |
| LVXS_HILIGHTSUBITEMS | |
| LVXS_LINESBETWEENCOLUMNS | Paints vertical lines between columns. |
| LVXS_LINESBETWEENITEMS | Paints horizontal lines between items. |
| LVXS_NOGROWCOLUMNONDELETE | Prevents automatic resizing of column 0 when a column is deleted. |
| LVS_NOCOLUMNHEADER | Specifies that additional columns do not display column headers. This style is automatically removed by specifying the TVXS_COLUMNHEADER style, which causes all columns to display headers. |
| LVXS_WORDWRAP | Enables word wrapping of item text if the column is narrow. The TVXS_WORDWRAP style automatically enables this style. |
| LVXS_OWNERDRAWVARIABLE | Reserved. |
The following styles are not supported by SECTreeCtrl or SECTreeView:
TVS_CHECKBOXES
TVS_FULLROWSELECT (use LVXS_HILIGHTSUBITEMS)
TVS_INFOTIP
TVS_NONEVENHEIGHT
TVS_NOSCROLL (use LVS_NOSCROLL)
TVS_NOTOOLTIPS (use LVXS_FLYBYTOOLTIPS/TVXS_FLYBYTOOLTIPS)
TVS_RTLREADING
TVS_SINGLEEXPAND
TVS_TRACKSELECT
The following figure illustrates some of the standard styles that the Objective Toolkit tree control shares with CTreeCtrl in addition to TVXS_FLYBYTOOLTIPS.
The following figure illustrates some of the extended styles.
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