i want to acsees outline amount in edit spline

i want to acsees outline amount in edit spline can anyone help me ?
this is my code but is not work
(
amount= 45
WM_SETFOCUS = 0x007
VK_RETURN=0x000D
WM_CHAR=0x0102
WM_ACTIVATE = 0x6
SendKeys = dotNetClass "System.Windows.Forms.SendKeys"

fn Out_am =
(

tti=for i in windows.getChildrenHWND (windows.getDesktopHWND()) where i[5] == "Geometry" do exit with i[3]
tti_ch = windows.getChildrenHWND tti
UIAccessor.sendMessage tti_ch[64][1] WM_SETFOCUS 0 0
am=amount as string
SendKeys.SendWait am
--windows.sendMessage tti_ch[64][1] WM_CHAR VK_RETURN 0
)

)