Problem with killing Adobe Acrobat Reader

Code used to launch the process

nativeProcess = new Process();
nativeProcess.StartInfo.FileName = filePath;
nativeProcess.Start();

These are Microsoft Office Files or Adobe Acrobat.

Code used to kill

if (nativeProcess != null)
{
    try
    {
        nativeProcess.Kill();
    }
    catch { }
}
if (nativeProcess != null)
{
    try
    {
        nativeProcess = null;
    }
        catch { }
}

My problem is that Adobe Acrobat Reader does not Kill() when the app is running as a Citrix app.
If I log on at the Citrix box and run it as a Desktop app then Acrobat Kill() works.

Microsoft Office Kills() fine as both a Citrix app and a Deskop app.

User can close Acrobat Reader using the X or close