diff --git a/SimpleStateMachineNodeEditor/CodeMap1.dgml b/SimpleStateMachineNodeEditor/CodeMap1.dgml
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diff --git a/SimpleStateMachineNodeEditor/ViewModel/NodesCanvas/ViewModelNodesCanvasCommands.cs b/SimpleStateMachineNodeEditor/ViewModel/NodesCanvas/ViewModelNodesCanvasCommands.cs
index 2f117bc..ab5018b 100644
--- a/SimpleStateMachineNodeEditor/ViewModel/NodesCanvas/ViewModelNodesCanvasCommands.cs
+++ b/SimpleStateMachineNodeEditor/ViewModel/NodesCanvas/ViewModelNodesCanvasCommands.cs
@@ -324,12 +324,35 @@ private void Open()
#region setup start state
- var startState = stateMachineXElement.Element("StartState")?.Attribute("Name")?.Value;
-
- if (string.IsNullOrEmpty(startState))
+ var startStateElement = stateMachineXElement.Element("StartState");
+ if (startStateElement == null)
+ {
this.SetupStartState();
+ }
else
- this.SetAsStart(this.Nodes.Items.Single(x => x.Name == startState));
+ {
+ var startStateAttribute = startStateElement.Attribute("Name");
+ if(startStateAttribute==null)
+ {
+ Error("Start state element don't has name attribute");
+ return;
+ }
+ else
+ {
+ string startStateName = startStateAttribute.Value;
+ var startNode = this.Nodes.Items.SingleOrDefault(x => x.Name == startStateName);
+ if (startNode==null)
+ {
+ Error(string.Format("Unable to set start state. Node with name \"{0}\" don't exists", startStateName));
+ return;
+ }
+ else
+ {
+ this.SetAsStart(startNode);
+ }
+ }
+
+ }
#endregion setup start state
diff --git a/img/Custom window.jpg b/img/Custom window.jpg
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index 0000000..6053f7a
Binary files /dev/null and b/img/Custom window.jpg differ
diff --git a/img/Scaling.gif b/img/Scaling.gif
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index 0000000..558d638
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diff --git a/img/Themes.jpg b/img/Themes.jpg
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index 0000000..aa71e56
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diff --git a/img/adding.gif b/img/adding.gif
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index 0000000..7053e48
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diff --git a/img/collapsing and moving.gif b/img/collapsing and moving.gif
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index 0000000..59fdd6e
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diff --git a/img/deleting transitions.gif b/img/deleting transitions.gif
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index 0000000..d167e2c
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diff --git a/img/jpg.jpg b/img/jpg.jpg
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diff --git a/img/moving transitions.gif b/img/moving transitions.gif
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index 0000000..30abd31
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diff --git a/img/naming for states and transitions.gif b/img/naming for states and transitions.gif
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index 0000000..4e70776
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diff --git a/img/selection.gif b/img/selection.gif
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index 0000000..b264b43
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diff --git a/img/undo and redo.gif b/img/undo and redo.gif
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index 0000000..d846c1e
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diff --git a/img/xml.jpg b/img/xml.jpg
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index 0000000..4c8b0b9
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diff --git a/samples/sample.xml b/samples/sample.xml
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index 0000000..988341c
--- /dev/null
+++ b/samples/sample.xml
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\ No newline at end of file