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ShellBrowser Delphi Components Documentation
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ShellControls.TJamShellTree.OnBeforeShellDrag
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ShellBrowser Delphi Components Documentation
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Happens when the user starts a shell drag operation.
property OnBeforeShellDrag: TOnBeforeShellDragEvent;
The IDataObject is provided as var parameter. You can set it to nil to prevent the shell drag operation.