Using design definition for computed properties - xpages

Question

I cant find a solution for this problem. I am using design definitions for almost all my controls.
They are working fine the only problem i have is that if i am computing one of the properties i cant use the property anymore in the design definition. It will create a text in red and the xpages will prompt some error messages.
Is there a way to ask if the property is computed and show a standard text instead.
This is the design definition.
<?xml version="1.0" encoding="UTF-8"?>
<xp:view xmlns:xp="http://www.ibm.com/xsp/core" xmlns:xc="http://www.ibm.com/xsp/custom">
<xp:inputText type="text" value="<%=this.field_name %>"></xp:inputText>
</xp:view>
Whenever the value of the property field_name is computed in the custom control it brings up that error.
Anybody any ideas?
When I insert the Field custom control with a static text value for field_name, the design definition will display the field_name properly.
<xc:Field field_type="text" field_name="myfield_1"></xc:Field>
If I insert the Field custom control with a computed text value for field_name, it doesn't:
<xc:Field field_type="text"><xc:this.field_name><![CDATA[# {javascript:"myfield_"+#Text(1)}]]></xc:this.field_name>
</xc:Field>

Answer 1

Make sure field_name is the exact name of the property passed in as CompositeData. For example, I was able to reference the string property 'create' to create the image of field this way:
<?xml version="1.0" encoding="UTF-8"?>
<xp:view xmlns:xp="http://www.ibm.com/xsp/core">
<xp:inputText value="<%=this.create%>">
</xp:inputText>
</xp:view>
So, I suspect it's a typo, a missing property, or not a string.