The itemref tag refers to (and includes in the current toolbar) a toolbar item that was defined either inside a previous toolbar or outside of all toolbars.
id, {showIf}
id=" id_reference " Required. Must be the ID of an item that was previously defined or included in the file. does not allow forward references. If a toolbar item tag references an ID that hasn't been defined, reports an error and ignores the reference.
showIf=" script " Specifies that this item appears only on the toolbar if the specified script returns true . For example, you can use showIf to show certain buttons only in a given application or only when a page is written in a server-side language such as ColdFusion, ASP, or JSP. If you do not specify showIf , the item always appears. checks this property whenever the item's enabler runs; that is, according to the value of the update attribute. You should use this attribute sparingly. The showIf attribute can be used either in the item definition or in a reference to the item from a toolbar. If both the definition and the reference specify the showIf attribute, shows the item only if both conditions are true. The showIf attribute is equivalent to the showIf() function in a command file.
None.
The toolbar tag or the toolbarset tag.
<itemref id="strikeout_button">
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