protected boolean isInsertAllowed(int rowIndex, DataType datatype) {
		return false;
	}
Returns whether or not insertion of the specified data type is allowed
at the specified index.

@param rowIndex row index of the component in the composite data type.
@param datatype the data type to be inserted.
@return true if insert allowed, else false
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/compositeeditor/CompositeEditorModel.java