PowerPoint VBA .SetShapesDefaultProperties not working for arrowheads

Experts:

You guys are always so good at these obscure programming questions.  Here another one.

I'm providing a command button on a PowerPoint Add-in toolbar that helps the user draw a stylized line with arrowhead in the proper thickness, dash style, color, etc.

I accomplish this by having VBA draw a small dummy line, stylizing it as desired, setting its properties as the default shape properties, then deleting it.  Then I use SendKeys to put the user into drawing mode with arrow selected.  

Works fine except that the endArrowHead properties do not seem to "stick" and I get the default arrowhead.  Try out my code and you'll see what I mean.  
Sub DrawHorizLineWithArrowhead()

Dim myline As Shape
Dim currentslide As Slide

Set currentslide = ActivePresentation.Slides(ActiveWindow.View.Slide.SlideIndex)

Set myline = currentslide.Shapes.AddLine(10, 10, 50, 50)
With myline.Line
    .Weight = 2
    .DashStyle = msoLineRoundDot
    .DashStyle = msoLineSysDot
    .ForeColor.ObjectThemeColor = 3
    .ForeColor.Brightness = 0.4
    .BeginArrowheadStyle = msoArrowheadOval
    .EndArrowheadStyle = msoArrowheadTriangle
    .EndArrowheadWidth = msoArrowheadWide
    .EndArrowheadLength = msoArrowheadLong
End With

myline.SetShapesDefaultProperties
myline.Delete

SendKeys ("%")
SendKeys ("N")
SendKeys ("SH")
SendKeys ("{DOWN}{DOWN}{RIGHT}{ENTER}")

End Sub

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Anybody know why the arrowhead styling is not being saved along with the other default properties?  I get the same result if I manually right-click my dummy line and "save as default line" so I think it's a PowerPoint issue, not a VBA issue.  Is there a workaround?  THANKS.
Bryce BassettFreelance VBA programmerAsked:
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Rgonzo1971Commented:
HI,

If you select the line instead of the arrow you should get the result you want.
SendKeys ("{DOWN}{DOWN}{ENTER}")

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Regards
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JSRWilsonCommented:
But all lines will be set to this default.

Since you are writing an Add In I would trap the select event and use it to detect a new arrow being added and set the properties accordingly. You could have a check box on the ribbon to set whether it was the normal default or you new style.
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Bryce BassettFreelance VBA programmerAuthor Commented:
Thanks, Rgonzo1971.  Your solution works.   I don't quite understand why but that's not important.

JSR, I was intentionally changing the default line, but on further thought, I might want to leave it alone.  

I'm a self-taught VBA programmer so I'm struggling a bit with your suggestion to "trap the select event and use it to detect a new arrow being added and set the properties accordingly."   Can you spell out for me how I would code this?    What I'm trying to accomplish, as you can see, is to make it so the NEXT line drawn has the correct properties.  If after drawing that line, successive lines revert to the default, that would be ideal, but I don't get exactly how to do that.  

Thanks both.
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JSRWilsonCommented:
probably too complicated then!
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