no way
I've put a breakpoint in the Behavior property setter and here are the call-stacks when the breakpoint got hit:
This is the call stack when clicking the "Draw links" button, the Behavior is set to DrawArrow:
>FlowChart.NET.dll!MindFusion.FlowChartX.FlowChart.Behavior.set(MindFusion.FlowC
hartX.BehaviorType value = CreateArrow) Line 4823C#
VantageShared.dll!VantageShared.CaseManagement.CaseRendering.ExtendedFlowchart.E
xtendedFlowchart.set_ManipulationMode(VantageShared.CaseManagement.CaseRendering
.ExtendedFlowchart.ExtendedFlowchart.EManipulationMode Value = VantageShared.CaseManagement.CaseRendering.ExtendedFlowchart.ExtendedFlowchart.E
ManipulationMode.Link) Line 65 + 0xf bytesBasic
AlphaLaw-CaseManagement.exe!AlphaLaw_CaseManagement.CaseManagement.uscCaseDefEdi
tor.set_Mode(AlphaLaw_CaseManagement.CaseManagement.uscCaseDefEditor.EditMode Value = AlphaLaw_CaseManagement.CaseManagement.uscCaseDefEditor.EditMode.LinkNodes) Line 563 + 0x1a bytesBasic
AlphaLaw-CaseManagement.exe!AlphaLaw_CaseManagement.CaseManagement.uscCaseDefEdi
tor.tbmEditCase_ToolClick(Object sender = {Infragistics.Win.UltraWinToolbars.UltraToolbarsManager}, Infragistics.Win.UltraWinToolbars.ToolClickEventArgs e = {Infragistics.Win.UltraWinToolbars.ToolClickEventArgs}) Line 1153 + 0xe bytesBasic
[External Code]
This is the call stack shown when I release the mouse button while drawing an arrow, the Behavior is set to Modify here:
>FlowChart.NET.dll!MindFusion.FlowChartX.FlowChart.Behavior.set(MindFusion.FlowC
hartX.BehaviorType value = Modify) Line 4823C#
AlphaLaw-CaseManagement.exe!AlphaLaw_CaseManagement.FlowchartScrollHelper.StopSc
roll() Line 80 + 0x15 bytesBasic
AlphaLaw-CaseManagement.exe!AlphaLaw_CaseManagement.FlowchartScrollHelper.flowch
art_Click(Object sender = {VantageShared.CaseManagement.CaseRendering.ExtendedFlowchart.ExtendedFlowchart}
, System.EventArgs e = {System.Windows.Forms.MouseEventArgs}) Line 89 + 0xa bytesBasic
[External Code]
That last assignment to Behavior is done before the flowchart handles the MouseUp event, so it breaks the arrow creation.
HTH