How to Close a custom dialog?Here,'close' means invisible.

[PysnLiu]

I've defined a custom dialog,which belongs to a feature.And i didn't place this dialog in OnFirstUIBefore.When this dialog displays,i push the NEXT button,the dialog still exists.
How can I close this dialog?I've tried EndDialog() and Disable(BACKGROUND),neither working.

[RobertDickau]

Perhaps related to Disable(DIALOGCACHE)?

[J_anitha]

EndDialog (szDialogName) and then ReleaseDialog (szDialogName)