Sendkeys F5 using Automation vs Dotnet

Hello Experts,

I am trying to use the Sendkeys F5 methodology when updating a calculated field in the Parent Page when a line from Child List Part is updated.  I am hoping to use the dotnet (systemwidnwosformssendkeys dotnet system.windows.forms) as it doesn't seem to pop up the automation dialog.  See below:

SystemWindowsFormsSendKeys DotNet 'System.Windows.Forms, Version=2.0.0.0,  Culture=neutral,PublicKeyToken=b77a5c561934e089'.System.Windows.Forms.SendKeys

//Update a page

SystemWindowsFormsSendKeys.SendWait('{F5}');

SystemWindowsFormsSendKeys.SendWait('{F5}');

But this doesn't seem to work.  I don't see the calc fields from Parent page updating.

However, if I use automation (see below), it works.  But I hate that the automation dialog always pops up even though only initially.

IF ISCLEAR(wshShell) THEN
  CREATE(wshShell,FALSE,TRUE);

wshShell.SendKeys('{F5}');
wshShell.SendKeys('{F5}');

Can you advise why the dotnet technique doesn't seem to work?