Replaced the 2 tabs variable and code in CodeFileEditor by only one type with SplitterWindow and fixed drag'n drop of variable from variable to code.
<xsd:element name="Xenomai">
<xsd:complexType>
%(toolchain_gcc)s
<xsd:attribute name="XenoConfig" type="xsd:string" use="optional" default="xeno-config"/>
</xsd:complexType>
</xsd:element>