Event to draw whichever elements you need , such as text , icons , check boxes , plus and minus signs , and lines connecting the nodes 事件以绘制所需的所有元素，例如文本、图标、复选框、加号和减号以及连接节点的线条。
You can also configure elements so that the plus and minus signs appear automatically in the margin when the elements exceed a certain size 还可以配置元素，以便当元素超过特定大小时自动在旁边显示加号( + )和减号( - ) 。
Gets or sets a value indicating whether plus - sign and minus - sign buttons are displayed next to tree nodes that contain child tree nodes 获取或设置一个值，用以指示是否在包含子树节点的树节点旁显示加号( + )和减号( - )按钮。
A minus sign image displayed next to a node in the middle of the tree structure at a t - intersection to indicate that the node is expanded Tminus . gif显示在树结构中间（ t型交叉处）的节点旁边以指示该节点已展开的减号( - )图像。
The value of this must be a real number from 09 , positive or negative , matching the production number with an optional leading minus sign 此属性的值必须是09的实数，正数负数都可以，将包含可选的前导减号( - )的生成编号匹配。
This event occurs when the user clicks any portion of a tree node with the mouse , including the plus sign or minus sign 当用户使用鼠标单击树节点中的任何部分（包括指示节点是折叠还是展开的加号“ + ”或减号“ - ” ）时，将发生此事件。
Submenu . a minus sign appears in the indicator margin beside the opening brace of each subsection of code that is also enclosed in braces 在大括号左半部分( " { " ) （位于外侧也括有大括号的每个子代码段中）旁边的指示器边距中会出现一个减号( - ) 。
A minus sign image displayed next to the first root node in a tree structure that contains multiple root nodes to indicate that the node is expanded Rminus . gif显示在包含多个根节点的树结构的第一个根节点旁边以指示该节点已展开的减号-图像。
A minus sign image displayed next to the root node when there is only one root node in the tree structure to indicate that the root node is expanded Dashminus . gif在树结构中只有一个根节点时，显示在根节点旁边以指示该根节点已展开的减号( - )图像。
Control displays a plus sign or minus sign or a placeholder image next to a node to indicate whether the node is expandable , collapsible , or non - expandable , respectively 控件会在节点旁显示加号( + ) 、减号( - )或占位符图像，以分别指示该节点是可展开的、可折叠的还是不可展开的。
