Hello,
I had the same problem and I found that in method fromFile of class SysTreeNodeVSItem treeNode variable is going to be null when we
SysTreeNodeVSItem::importFromFile(_filename, vsItemNode);
So I stored the path of the treeNode and reinitialize it after import.
public void fromFile(FilenameOpen _filename)
{
VSProjectFileNode vsItemNode = this.parmTreeNode() as VSItemNode;
str path = vsItemNode.treeNodePath();
TreeNode treeNodeLocal;
SysTreeNodeVSItem::importFromFile(_filename, vsItemNode);
treeNodeLocal = TreeNode::findNode(path);
this.parmTreeNode(treeNodeLocal);
vsItemNode = this.parmTreeNode() as VSItemNode;
}
It worked for me.