diff --git a/client/project-creation-modal.ls b/client/project-creation-modal.ls
index 175d002..6d8a237 100644
--- a/client/project-creation-modal.ls
+++ b/client/project-creation-modal.ls
@@ -5,17 +5,31 @@ UUID  = require "uuid/v4"
 bulma = require "./bulma.ls"
 
 ProjectCreationModal = (project, todod-ws) ->
+
+	# work on a copy of the columns
+	# in case of cancelled modifications, only the copies are changed
+	columns-copy = []
+	for col in  project.extra_properties.columns
+		new-col = {}
+		for k,v of col
+			console.log "element : ", k, "value: ", v
+			new-col[k] = v
+		columns-copy ++= [ new-col ]
+
 	self = {
 		title: project.title || ""
+		# TODO XXX FIXME
 		new-user: "Coucou 2 le retour"
+		new-column-input: {
+			title: "New column !"
+		}
+
 		extra_properties:
-			columns: project.extra_properties.columns || []
+			columns: columns-copy
 	}
 
 	modal = Modal {
 		+visible
-		new-column-input: "New column !"
-
 		content-render: (self) ->
 			h \div.form [
 				h \input.input {
@@ -50,7 +64,9 @@ ProjectCreationModal = (project, todod-ws) ->
 
 					h \ul.menu-list self.extra_properties.columns.map (column) ->
 
-						h \li [
+						h \li {
+							key: column.id
+						} [
 							h \input.input {
 								key:       column.id
 								value:     column.title
@@ -61,21 +77,27 @@ ProjectCreationModal = (project, todod-ws) ->
 							h \div.button {
 								onclick: ->
 									# TODO: create a new entry in self.extra_properties.columns
-									self.extra_properties.columns = self.extra_properties.select((.id != column.id))
+									self.extra_properties.columns := self.extra_properties.columns.filter((.id != column.id))
+									# self.todod-ws.edit-list
+									# todod-ws.edit-list project.id, self
 							} [ "X" ]
 						]
 
 					h \input.input {
-						value:     self.new-column-input
+						value:     self.new-column-input.title
 						oninput: (e) ->
-							self.new-column-input := e.target.value
+							self.new-column-input.title := e.target.value
 					} [ ]
 
 					h \div.button {
 						onclick: ->
 							# TODO: create a new entry in self.extra_properties.columns
-							self.extra_properties.columns ++= [ self.new-column-input ]
-							self.new-column-input := "New column !"
+							new-col = {
+								id: UUID!
+								title: self.new-column-input.title
+							}
+							self.extra_properties.columns ++= [ new-col ]
+							self.new-column-input.title := "New column !"
 					} [ "+" ]
 				]
 			]
diff --git a/client/project.ls b/client/project.ls
index 0590ffb..1006299 100644
--- a/client/project.ls
+++ b/client/project.ls
@@ -18,7 +18,9 @@ Project = (self, todod-ws) ->
 			task.extra_properties && task.extra_properties.column && task.extra_properties.column == column.id
 			|| ((! task.extra_properties || ! task.extra_properties.column) && first)
 
-		h \div.column [
+		h \div.column {
+			key: column.id
+		} [
 			h \div.card { key: self.id } [
 				h \div.cart-head [
 					h \p.title.is-4 [ column.title ]
diff --git a/client/task-creation-modal.ls b/client/task-creation-modal.ls
index bb20b3d..c5b826f 100644
--- a/client/task-creation-modal.ls
+++ b/client/task-creation-modal.ls
@@ -14,35 +14,35 @@ TaskCreationModal = (project, todod-ws, task) ->
 
 	modal = Modal {
 		+visible
-		content: h \div.form [
-			h \input.input {
-				value: self.title
-				oninput: (e) ->
-					self.title := e.target.value
-			}
+		content-render: (self) ->
+			h \div.form [
+				h \input.input {
+					value: self.title
+					oninput: (e) ->
+						self.title := e.target.value
+				}
 
-			h \textarea {
-				value: self.description
-				oninput: (e) ->
-					self.description := e.target.value
-			}
+				h \textarea {
+					value: self.description
+					oninput: (e) ->
+						self.description := e.target.value
+				}
 
-			h \aside.menu [
-				h \p.menu-label [ "Choose the column" ]
-				h \ul.menu-list project.extra_properties.columns.map (column) ->
-
-					h \li [
-						h \a  {
-							classes: {
-								is-active: self.extra_properties && self.extra_properties.column == column.id
-							}
-							onclick: ->
-								self.column := column.id
-						} [ column.title ]
-					]
+				h \aside.menu [
+					h \p.menu-label [ "Choose the column" ]
+					h \ul.menu-list project.extra_properties.columns.map (column) ->
 
+						h \li [
+							h \a  {
+								classes: {
+									is-active: self.extra_properties && self.extra_properties.column == column.id
+								}
+								onclick: ->
+									self.column := column.id
+							} [ column.title ]
+						]
+				]
 			]
-		]
 		on-validation: ->
 			if task.id
 				todod-ws.edit-task task.id, {
@@ -59,7 +59,7 @@ TaskCreationModal = (project, todod-ws, task) ->
 						column: self.column || ""
 					}
 				}
-	}
+	}, self
 
 	self.render = ->
 		modal.render!