fixes docs

Signed-off-by: Christian Biasuzzi <christian.biasuzzi@soft.it>

docs/user_guide/nad_widget.md

@@ -37,7 +37,7 @@ display_nad(svg, invalid_lf: bool = False, enable_callbacks: bool = False, grayo
 
 - svg: the input SVG, as str or class providing an svg and metadata representation
 - invalid_lf: when True the opacity style for some of the displayed info's (e.g., active and reactive power) is decreased, making them barely visible in the diagram.
-- enable_callbacks: if True, enable the callbacks for selecting nodes (through a shift+click on a node) and moving nodes.
+- enable_callbacks: if True, enable the callbacks for selecting nodes (through a shift+click on a node) and moving nodes. Please note that this feature is working with versions of PyPowSyBl equal or greater than v1.8.1.
 - grayout: if True, changes the diagram elements' color to gray.
 
 
@@ -48,7 +48,7 @@ update_nad(nadwidget, svg, invalid_lf: bool = False, enable_callbacks: bool = Fa
 - nadwidget: the existing widget to update
 - svg: the input NAD's SVG
 - invalid_lf: when True the opacity style for some of the displayed info's (e.g., active and reactive power) is decreased, making them barely visible in the diagram.
-- enable_callbacks: if True, enable the callbacks for selecting nodes (through a SHIFT+CLICK on a node) and moving nodes.
+- enable_callbacks: if True, enable the callbacks for selecting nodes (through a SHIFT+CLICK on a node) and moving nodes. Please note that this feature is working with versions of PyPowSyBl equal or greater than v1.8.1.
 - grayout: if True, changes the diagram elements' color to gray.
 
 ## Customize widget's interactions
@@ -64,6 +64,8 @@ Use these widget's methods to register a callback on a specific event:
 
 The [network explorer widget](/user_guide/network_explorer.md) demonstrates the approach.
 
+Please note that the callbacks works with versions of PyPowSyBl equal or greater than v1.8.1.
+
 Example: the code below activates a callback when a node is selected (through SHIFT+CLICK) in the widget (it prints the selected node's ID to the log).
 
 ```python

docs/user_guide/network_explorer.md

@@ -23,7 +23,7 @@ The selected voltage level is the displayed NAD's center.
 
 A 'depth' slider controls the size of the sub network.
 
-Selecting a VL's node (through SHIFT+CLICK) will activate the SLD panel on the corresponding voltage level.
+Selecting a VL's node (through SHIFT+CLICK) will activate the SLD panel on the corresponding voltage level. Please note that this feature is working with versions of PyPowSyBl equal or greater than v1.8.1.
 
 ## Single Line tab
 
@@ -38,6 +38,8 @@ Switches can also be clicked, causing their status in the network to change; Ple
 ![network-explorer MAP tab](/_static/img/network_explorer_3.png)
 
 The 'Network map' displays the network's substations and lines on a map. The map is empty if the network does not contain geo data.
+Please note that substation's and line's IIDM extensions are only available in PyPowSyBl starting from v1.5.0; With earlier versions of PyPowSyBl the map would be empty, too.
+
 By clicking on a substation, a list with the substation's voltage levels appears. 
 
 ![network-explorer MAP tab VLs list](/_static/img/network_explorer_4.png)

src/pypowsybl_jupyter/nadwidget.py

@@ -72,7 +72,7 @@ def display_nad(svg, invalid_lf: bool = False, enable_callbacks: bool = False, g
     Args:
         svg: the input SVG, as str or class providing an svg and metadata representation
         invalid_lf: when True the opacity style for some of the displayed info's (e.g., active and reactive power) is decreased, making them barely visible in the diagram.
-        enable_callbacks: if True, enable the callbacks for moving and selecting nodes in the diagram.
+        enable_callbacks: if True, enable the callbacks for moving and selecting nodes in the diagram. Please note that this feature is working with versions of PyPowSyBl equal or greater than v1.8.1.
         grayout: if True, changes the diagram elements' color to gray.
 
     Returns:
@@ -96,7 +96,7 @@ def update_nad(nadwidget, svg, invalid_lf: bool = False, enable_callbacks: bool
         nadwidget: the existing widget to update
         svg: the input NAD's SVG
         invalid_lf: when True the opacity style for some of the displayed info's (e.g., active and reactive power) is decreased, making them barely visible in the diagram.
-        enable_callbacks: if True, enable the callbacks for moving and selecting nodes in the diagram.
+        enable_callbacks: if True, enable the callbacks for moving and selecting nodes in the diagram. Please note that this feature is working with versions of PyPowSyBl equal or greater than v1.8.1.
         grayout: if True, changes the diagram elements' color to gray.
 
     Examples: