Hiding default custom property categories on a web part

Hi All,
I'm developing a web part with some custom properties. I have no use for the default attribute categories (Appearance, Layout, Advanced) and I'd like to simplify the UI for the user.
Is there a way to hide the default property categories on the tool pane via code?
Is there a way to have my property category open by default rather than the Appearance category?
Thanks for any help
Andy

The Moderator note is from 2011 and the Moderator is long gone. It's therefore pointless commenting on it now especially with a comment that missed the point of the Moderator note that had nothing to do with the answer given and everything to do with the
person proposing *his own* post as the answer. But not as pointless as posting in Spanish to an English language forum. There are Spanish language forums for you to use (and less annoying Moderators or ex-Moderators there).
SP 2013 "FAQ" (useful links):
http://spf2013faq.mindsharp.com/default.aspx
SP 2010 "FAQ" (useful links, book lists):
http://wssv4faq.mindsharp.com/default.aspx
WSS3/MOSS FAQ (FAQ; Books and Links) http://wssv3faq.mindsharp.com/default.aspx

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Please remember to mark your question as "answered" if this solves your problem.

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Best Regards
Forum Support
Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Subscriber Support, contact
[email protected].
Jerry Guo
TechNet Community Support

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Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Subscriber Support, contact
[email protected]
Wendy Li
TechNet Community Support

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Code
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pdfDoc.Open();
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Error
Server Error in '/' Application.
RegisterForEventValidation can only be called during Render();
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
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Stack Trace:
[InvalidOperationException: RegisterForEventValidation can only be called during Render();]
System.Web.UI.ClientScriptManager.RegisterForEventValidation(String uniqueId, String argument) +11081278
System.Web.UI.WebControls.TextBox.AddAttributesToRender(HtmlTextWriter writer) +455
System.Web.UI.WebControls.WebControl.RenderBeginTag(HtmlTextWriter writer) +27
System.Web.UI.WebControls.TextBox.Render(HtmlTextWriter writer) +27
System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +240
System.Web.UI.HtmlControls.HtmlContainerControl.Render(HtmlTextWriter writer) +42
System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +240
System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +240
System.Web.UI.HtmlControls.HtmlForm.RenderChildren(HtmlTextWriter writer) +411
System.Web.UI.HtmlControls.HtmlForm.Render(HtmlTextWriter output) +87
System.Web.UI.HtmlControls.HtmlForm.RenderControl(HtmlTextWriter writer) +53
System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +240
System.Web.UI.HtmlControls.HtmlContainerControl.Render(HtmlTextWriter writer) +42
System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +240
System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +240
System.Web.UI.Page.Render(HtmlTextWriter writer) +38
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Version Information: Microsoft .NET Framework Version:2.0.50727.5472; ASP.NET Version:2.0.50727.5474

Hi,
We know that the Page.EnableEventValidation property is set to true（The default is true.）, Sharepoint Custom web(ASP.NET Web) validates that a control event originated from the user interface that was rendered by that control. A control registers its
events during rendering and then validates the events during postback or callback handling.
If you write client script freely,you might have to set "EnableEventValidation = false" in your C# code behind,but this method may be troublesome in SharePoint,
so the method of "sadomovalex"( http://sadomovalex.blogspot.in/) is a good idea.
Best Regards

Hiding default custom property categories on a web part

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